/Engine/Plugins/Enterprise/VariantManagerContent/Source/VariantManagerContentEditor/Public/VariantManagerContentEditorModule.h
This will be executed whenever FLevelVariantSetsAssetActions::OpenAssetEditor is called with a valid asset. This so that the editor toolkit can be on the VariantManager plugin and the AssetActions can be on this module
void RegisterOnLevelVariantSetsDelegate ( [FOnLevelVariantSetsEditor](API\Plugins\VariantManagerContentEditor\FOnLevelVariantSetsEditor) Delegate )